Corrosion resisting valve



Nov. 16, 1948. o. w. GREENE 2,454,160

CORROSION RES ISTING VALVE Filed Aug. 31, 1943 5 Sheets-Sheet 1INVENTOR.

greens NOV. 16, 1948. w, GREENE 2,454,160

CORROSION RESISTING VALVE Filed Aug. 31, 1943 5 Sheets-Sheet 5 Nov. 16,1948. o. w. GREENE CORROSION RESIS'IING VALVE 5 Sheets-Sheet 4 FiledAug. 31, 1943 III/I INVENTOR.

Nov. 16, 1948. o. w. GREENE 2,454,160

CORROSION RESISTING VALVE Filed Aug. 51, 1943 5 Sheets-Sheet 5 INVENTOR-OZfi? Wfi'reene W %&'5 Jifornegys Patented Nov. 16, 1948 CORROSIONRESISTING VALVE Otto W. Greene, Brighton, N. Y., animal to The Pfaudler00., Rochester, N. Y., a corporation of New York Application August 31,1943, Serial No. 500,669

This invention relates to valves which are rendered substantiallynon-corrosive by the use of materials capable of resisting chemicalattack, for the purpose of meeting the severe requirements of fieldsinvolving the use of acids and other chemicals tending to corrodemetallic materials. It has been proposed heretofore to meet suchrequirements with valves of standard constructions except for thesubstitution, at the parts subjected, to chemical attack, of alloys of acharacter more or less resistant to attack. Such constructions have beenopen to the objections that they are not sulilciently resistant tocorrosion, are not so designed as to be readily reground when corrodedto reseat the valve, and have depended for tight closure upon excessivepressure between the valve and valve seat, so as to restrict thematerials available for such parts.

It has been attempted, on the other hand, to construct such valves ofceramic materials upon which chemicals have little effect, but such attempts have been open to the objection that these materials havinglimited strength except in compression, are very brittle, when formed inthin sections, so as to require the resort to objectionably thick wallsand heavy, cumbersome designs. Furthermore, when ceramic materials areemployed in non-uniform sections, they are excessively frail as againststresses resulting from changes in temperature alone, as well asstresses commonly imposed in operation, by connection with pipe lines,and the like.

One object of the invention, therefore, is to. provicle a valve for theabove purposes in which the parts exposed to chemical attack are made ofmaterials having the chemical resistance of ceramic compositions, but inwhich the body portion or housing is made with sections of substantiallyuniform and practicable thickness and having the strength of metalmaterials.

Another object is to provide a valve of the above character having ametal housing to provide the desired strength, and with all the metalsurfaces lined with vitreous enamel, and with a ceramic valve head andseat, to provide a high degree of resistance to reaction with chemicals.

Another object is to provide a valve of the above type having a ceramicvalve head and seat ring with uniform cross sectional dimensions and soconstructed and arranged that the stresses imposed thereon bytemperature changes and in operation are limited to stresses of acompressive nature.

Another object is to afford a unitary, strong and durable valve head andstem in which the 6 Claims. (Cl. 251-158) valve head may be readilyequipped with interchangeable seating surfaces of various materials forvarious uses.

Another object is to provide such a valve having a constructionaffording ready access to the valve head, valve stem and seat. forconvenient repair or replacement.

Another object is to provide such a valve with means by which theseating surfaces may be readily cleaned and lightly reground withoutremoval from the housing and without detaching the valve housing fromits connections.

Another object is the provision of a valve of the above type having itsinlet and outlet connections, valve parts, and operating means allcontained in a single housing adapted for assembly directly with theoutlet of a container or other conducting means, to serve as a flushvalve.

A further object is to provide such-a valve having one of its housingparts arranged for adjustment to one position to form an angle valve,and to another position to form a straight line valve.

A further object is to provide a valve having one housing partcontaining the outlet connection, valve parts and operating meanstherefor, and a second housing part adjustable to one position to forman angle valve, and to another position to form a straight line valve,with standard dimensions and flange connections in each of saidadjustments.

Still another object is the provision of a corrosion resisting valvehaving the above advantages and capable of various adaptations, as foruse, for example, as a flush outlet valve, a throttle valve, a safetyvalve and the like.

To these and other ends the invention resides in certain improvementsand combinations of parts, all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings:

Fig. 1 is a central, sectional view of a valve embodying the presentinvention, and showing the same applied in flush relation and at a 45angle to the flanged outlet of a liquid container or tank;

Fig. 2 is a plan view of an additional housing part for adapting thevalve shown in Fig. l to form either a 90 angle, or straight line valve,

for connection with a pipe line, or other conduit; Fig. 3 is a central,sectional view showing the valve parts of Figs. 1 and 2 assembled toform an angle valve for a pipe line;

Fig. 4 is a longitudinal, sectional view of the valve head and stem;

Fig. 5 is a plan view partly in section, showing I 3 the valveparts ofFig. 3 adjusted to form a straight line valve;

Fig. 6 is a top plan view of the parts shown in Fig. 5;

Fig. 7 is a central, sectional view showing the adaptation of theinvention to a throttle type valve capable of being arranged as either a90 angle valve, or a straight line valve;

Fig. 8 is a detail view, partly in section, of the valve head of Fig. 7

Fig. 9 is a central, sectional view showing the application of theinvention to a safety type valve adapted for use as either a 90 angle orstraight line valve;

Fig. 10 is a sectional detail view on-the line lllallla in Fig. 9;

Fig. 11 is an enlarged detail view, partly in section and broken away ofthe valve head shown in Fig. 9;

Fig. 12 is an enlarged detail view, partly in section, of a modifiedvalve head, and

Fig. 13 is an enlarged sectional detail view of the corresponding valveseat ring.

The invention is herein disclosed, by way of illustration, in apreferred embodiment of the same and in several adaptations thereof todiferent uses. In one adaptation, the inlet and outlet connections,valve head and seat, and operating means therefor are combined in asingle body or housing part having a flanged open side and adapted forapplication directly to the flanged outlet of a tank or other chemicalcontainer, to serve as a flush outlet valve. Referring more particularlyto Fig. 1 of the drawings, such housing part is indicated generally atID, as an iron or steel casting of the relatively thin and uniformcross-sectional dimensions commonly employed in standard metal valves.Housing part II] has an inlet opening at one side H and is formed aboutsaid opening with an annular shoulder I2, which is inclined or flaredoutwardly toward said opening, preferably at an angle to the axis of theopening of about 45, as shown, to support the valve seat, as hereafterdescribed. The housing is formed about said shoulder and open side witha flange l3, corresponding, in the present instance, to a standard 4"pipe flange provided with eight holes for attaching bolts 14. Housing Icomprises also a 3" outlet passage l having a flange I6 adapted forconnection with a standard 3" pipe line flange. At H on the housing is avalve stem stufling box terminating in a flange l8, as hereafterdescribed. The inner surfaces of housing part I 0 are coated with acorrosion-resisting material, such as the known vitreous, or glasslining material, as indicated at l9.

The valve seat is provided on a separately formed annular ring 20 ofceramic material, preferably a good quality of porcelain, with a surface2| flared outwardly or beveled at substantially the same angle as andseated on the shoulder l2 of the housing, a thin seating gasket of sheetpacking 22 being preferably interposed to form a tight joint. Ring 20 ispreferably of substantial and strong proportions, as shown, with asleeve portion 23 projecting outwardly somewhat beyond the flangedopening of housing l0, this projecting portion having an extrena-l annular recess 24 therein by which its outer diameter is reduced to lessthan that of the flanged opening of the housing. Projecting portion 23has an outwardly flared or beveled portion 25 which forms the valve seatbeyond which it has an outwardly flared end 26 adapted to be re- 4ceived within the conducting means with which part I0 is connected. Itwill be noted that the seat ring 20 has uniform cross-sectionaldimensions to promote uniform expansion and contraction under variationsin temperature.

In the adaptation of the invention shown in Fig. 1, housing part I0 isassociated directly with the outlet of a tank or other container toserve as a flush outlet valve. To this end, housing part II! has itsflange 13 connected by the bolts l4 with the flange 2l of the outlet 28of the container the body wall of which is indicated at 29. Interposedbetween flanges I3 and 21 is a gasket 30, of asbestos, rubber or thelike. The projecting end 23 of the porcelain seat ring exends, as shown,within the outlet 28 of the tank, with a space therebetween which ispreferably filled with any known or suitable, chemically resistantcement 3|, to form a tight Joint and a smooth and flush outflowconnection with the valve seat, particularly where the tank is arrangedwith its outlet at its bottom to drain it.

The valve head preferably comprises a body 32 of ceramic material, suchas a good quality of porcelain, mounted on a tubular metal valve stem33. The valve head, in this adaptation of the invention, is locatedoutside the valve seat and is preferably of uniform cross-sectional di-'mensions and strong proportions and thickness, as shown, with a recess34,Fig. 4,for receiving the valve stem. It is well adapted to resistthermal expansion and contraction and operating stresses and ispreferably formed with an annular flared or beveled surface 35 capableof cooperating directly with the valve seat 25. Preferably, the head hasalso an annular recess 36 in which is detachably seated a ring 31! ofsuitable seating material, such, for example, as hard rubber, syntheticplastics, or lead, or other metal, having a high chemical resistance.inwardly flared or beveled surface 38 adapted to seat against thesurface 25 of the seat ring 20. Ring 31 has a pressed fit with theannular recess in the valve head, but may be replaced by a ring of thesame or another material, as particular uses may require, or maybeomitted altogether, so that the surface 35 of the porcelain headcontacts directly with the seat ring 20. For such purposes, this ring 37of the head is readily accessible from the exterior of the housing andwithout disconnecting the housing, as hereafter described.

The valve stem 33 (Fig. 4) is preferably welded as at 39 to an end piece40, formed externally with anchoring grooves 4|. The end 40 is insertedwithin the recess 34 of the valve head, as shown, and secured in placeby an interposed filling of cement 42 interlocking with the grooves 4|,as well understood in the art. End piece 40 is preferably hollowed outas at 43, to maintain a substantially uniform thickness in the walls ofthe tubular stem, which is covered with a vitreous enamel or glasscoating 44, to protect it against chemical attack. At its other end, thestem is telescopically fitted and attached to the reduced portion 44 ofan enlarged end 45 of a solid, unglazed operating rod 46, to which areattached the means for operating the stem.

The valve stem is mounted in the stuffing box I! containing suitablepacking, as shown, and having the flange l8. The gland or followersleeve 48 is actuated by a bar 49 pressed downwardly by bolts 50, Fig.6, threaded into the base of the valve bonnet described below.

Means are provided for operating the valve.

Rin 31 has an stem, comprising means for moving it longitudinally toopen and close the valve, and also means for rotating it to clean orlightly grind the seating surfaces. Such operating means comprises avalve bonnet i (Fig. 3), embracing the valve stem and having a lowertriangular flange I! (Fig. 6) bolted to the flange l8 of the stuffingbox, as by bolts 52a. The bonnet has side openings 53 (Fig. 3) foraccess to the packing and an upper head 54 with a threaded central borein which is threadedly engaged a sleeve 55 turning loosely on theoperating extension 45 of the stem.

At 55 is a fitting for lubricating the threaded surfaces. Fixed on theupper end of sleeve 55 is a hand wheel 51, preferably with a solid orcircumferentially continuous and smooth flange, to prevent forcibieengagement and turning by a tool. Above the sleeve 55 is a similar butsmaller hand wheel 55 keyed to the operating extension of the stem bymeans of a shear pin 59 inserted in the terminal opening 41 of the stemextension. Sleeve 55 rotatably embraces the stem extension "between itsshoulder 45 and wheel 55.

It will be apparent from the above description that, by turning wheel51, threaded sleeve 55 is turned and moved longitudinally, to eflectlongitudinal movement of the sleeve stem, to open and close the valve.The continuous construction of hand wheel 51 makes it diflicult to applya wrench or other tool, thus tending to limit the force applied to theceramic valve head and seat. By turning the upper hand wheel 58, rotarymotion, only, is imparted to the stem and valve head in any position towhich they may be adjusted longitudinally by means of the other handwheel 51. In ordinary use, the valve is opened and closed by turninghand wheel 5! alone, but hand wheel 58 is occasionally rotated for thepurpose of rotating the valve head, while in light engagement with itsseat ring, to clean from the seating surfaces any accumulation of gritor other foreign substances, as well as to lightly grind such surfacesto maintain them in accurately mating, liquid tight engagement with eachother. The applied rotary force is limited by the manual actuation ofsmall wheel 58 and the strength of the shear pin 59.

With the valve housing part Ill and its associated parts remaining fixedto the flange outlet of a container, as shown in Fig. 1, access may behad from the container to the valve head and seat to clean the same orreplace the special rings 38 on the valve body. If desired, shear pin 59may -be removed from the stem, along with the bonnet and associatedparts, including the pack-' ing from the stuffing box, if necessary, andthe stem may then be removed through the container for replacement orrepair. By detaching the housing part ill from the container flange,seat ring 20 may be removed for repair or replacement.

It will be apparent from the above described construction that pipe linestresses resulting from temperature changes, or the drawing together ofjoints, are taken by the metal body portion only, without reaching theceramic valve head and seat elements. The latter are so shaped,associated and arranged as to receive only compressive stresses whichthese ceramic materials, of high compressive strength, are well adaptedto sustain without injury.

Thus the seat ring 20 is spaced from the-surfaces of the housing partsl0 and 25, as shown, and held between the resilient sheet packing 22 onthe inclined shoulder I! of housing part In and the thick resilientgasket :0 overlying the inclined shoulder of the container outlet 25 sothat any pressure applied to the porcelain ring seat by clampingtogether the flanges II and 21 is resiliently limited and appliednormally to its surfaces and is of the compressive nature which theporcelain material is adapted to withstand. Excessive pressure betweenthe flanges at any part of the periphery tends to force that part of thering inwardly and equalize the lateral pressure. Such minorlateral'pressure against the ring is directed compressively inwardlyagainst its convex periphery, in which direction also the ring isrelatively strong. The moderate seating pressure of the valve headapplied to surface 25 of the ring tends merely to compress it againstthe opposite, substantially parallel surface of shoulder I2, so that thestresses to which the seat ring are subjected are substantially limitedto those of a compressive character alone. Likewise, pressure applied tothe ceramic valve head 32, in closing it against its seat, is mainly acompressive force applied normally to its seating surfaces and which itis well adapted to sustain. It will be apparent also that all of thesurfaces of the valve housing and its parts, which are subjected tocontact with chemical contents, are composed of ceramic material whichis highly resistant to chemical attack, so that the valve is completelyprotected.

In the manufacture of the valve, the seat supporting shoulder I2 ismachined in precise conformity with the axis of the stuffing box andvalve bonnet with which the stem axis coincides, and

- the stem assembly is manufactured by a special method to maintain itsalinement with the stuffing box and seat. The high temperature at whichits vitreous coating is applied tends in some cases to produce warpagein the stem and, to guard against such defects, the porcelain head isassembled and cemented to one end of the coated stem in a fixture. Afterthe cement is dried, the head and the uncoated opposite end 45 of thestem are ground and machined in one position, concentric with the coatedintermediate portion of the stem which is mounted in the stuffing box.This provides for removal of all distortions so that when the stemassembly is finished and installed in the valve, its porcelain head ispositioned concentrically with the seat so that only a slight grindingoi the head into the seat is required in final assembly.

The above described valve assembly in housing part In may be similarlyapplied, for example, directly to a standard 4" flange of the lateralconnection of a T section of a pipe, or of any other conduit toafford a45" angle connection, and the invention further comprises a secondhousing part for adapting the above valve assembly for use as either aangle valve, or a straight line valve, as may be required. Such secondhousing part comprises a metal section 50 (Figs. 2, 3 and 5), having a4" flange 5| adapted to be bolted to flange l3 of the housing part Inwith its axis coinciding with the axis of the valve stem. Housing part50 is formed with a lateral inlet portion 52, having a 3" flange 53 ofgenerally rectangular shape, provided with bolt holes for attachment tothe flange of a standard pipe section 54, Fig. 3. Inlet 62 and flange 53preferably have their axis arranged to intersect the axis of the valvestem at an angle of approximately 45, as in the case of the outlet l5 ofpart 10, and flanges 53 and I5 are preferably at such a distance fromthe axis of the valve stem that the valve with its inlet and outletconnections has the same dimensions from center line to flange face, asstandard pipe elbows and other 90 angle sections, so as to be adaptedfor convenient use in any standard pipe line.

Housing part may also be adjusted, relative to housing part I0, to forma straight line valve, by changing it from the position shown in Fig. 3,through 180 to the position shown in Fig. 5, where it will be seen thatthe axis of inlet port 62 is alined with the axis of outlet I! of partl0. Such adiustability of part 00 makes the same valve conveniently andeconomically adaptable to various uses and associations.

The above described construction of housing part 60 affords the furtheradvantage of increasing the accessibility of the interior parts of thevalve. To this end the portion of housing part 60 lying substantially inline with the projected axis of the valve stem, is formed with acircular opening 65 having a diameter somewhat greater than the diameterof the valve body 32. Opening 65 is normally closed by a cover plate 66secured in place by bolts as 61, Fig. 2, passing through the cover andthrough 'fiange portions 68 at the sides of the Opening In either of thedescribed positions of adjustment of the housing part 60, and while thevalve remains connected in the pipe line, cover 60 may be removed andaccess thus obtained to the valve head and seat ring for inspecting orcleaning the same, replacing the ring 38 of the valve head, or the like.Or, by removing the operating means, bonnet and packing oi the valvestem, as already described, so asto free the stem, it may be entirelywithdrawn, with the valve head, through opening 65 for repair orreplacement, as required. By this means of entry on one side of thevalve seat. and by'entry, if necessary, through the outlet I on theopposite side of the seat, the interior parts of the valve are renderedconveniently accessible for the purposes described.

The interior surfaces of housing part 60, including cover plate 66 andthe flange connections, are preferably covered with any known orsuitable vitreous enamel or glass lining 69, to completely protect thesame against chemical attack, as described above in connection with thehousing part I0 and its associated elements. The latter remain the samewhether applied directly to a container outlet, as in Fig. l, or whetheremployed in conjunction with the housing part 60' for adaptation to useas an angle or straight line valve, as in Figs. 3 and 5, except that,when used in connection with the housing part 60, it is preferred toemploy a valve seat ring projecting to a lesser distance beyond theflange I3, as shown in Fig. 3, thereby locating the valve body nearer tothe housing part I0, to preserve ample clearance between the valve headand the walls of the housing part 60 in the open position of the valve.With such modification of the dimensions of the seat ring, and theposition of the valve head, the valve stem II is correspondinglyshorter.

The application of the invention to a throttle type valve is illustratedin Figs. 7 and 8. The valve there shown is generally similar in theconstruction and arrangement of parts to those shown in Figs. 3 to 6,inclusive, comprising a main casing or body portion I2 having a vitreouslining I3. The housing is parted and flanged, as before, adjacent theplane of the valve seat and formed with an inclined shoulder I4 for aporcelain seat ring l5v having the characteristics described above,except that it is arranged with its inclined seating surface 10 facinginwardly of the housing. The valve head is a ceramic body 'II having aseating surface 18 for cooperation with the ring by a movement of thestem 10 inwardlyof the housing. The stem and head otherwise have theconstruction described above and illustrated in Fig. 4, and the stem issimilarly mounted for rotary and reciprocating movement in a stuiflngbox 80. Similar means are provided on the bonnet, operated by a handwheel 8|, for reciprocating the stem longitudinally, and a similar wheel82 is provided on the stem for rotating it to regrind the seatingsurfaces.

At 83 is shown a similar auxiliary housing part for adapting the valveof Fig. 7 to serve either as a 90 angle valve or a straight line valve,as desired. Housing part 83 has a flange 84 clamped as by means of splitrings 85 and bolts 80 to the flange 81 of the main housing ortion 12.Interposed between the flanges is a gasket 88, as before, and, after thedesired adjustment of housing part 83, its connection with the seat ring15 is cemented as at 09, as described above, to insure a flushconnection. The position of housing portion 83 shown in full linescorresponds to a straight line arrangement of the valve, while thedotted line position for portion 83 corresponds to a angle arrangement,relative to the outlet on the main portion 12.

As further illustrating the wide application of the principles of theinvention, they are shown in Figs. 9 to 13, inclusive, as embodied in asafety or pop valve, comprising a main housing part 90 of the samegeneral construction already described, having a vitreous protectivelining Hi. The housing is formed as before with a 45 shoulder 92,compressively supporting a porcelain seat ring 93 of uniform'crosssection. as described. The housing is parted, as at 94, adjacent theplane of the seat and the opening so formed is provided with a flange 95having the usual holes for bolts 96 for attachment to a flanged tankoutlet, a pipe, or other connection, as desired.

This modification is equipped with an enameled metal valve stem 91 ofthe character described having fixed on its end a porcelain valve head08 of the same general construction as in the previous modifications,except that it is preferred, in this instance, to form the seatingsurface 99 of the valve head and the cooperating surface I00 of the seatring as portions of spherical surfaces, affording, in effect, 'a ballseat valve, the accurate seating of which is not aflected by smallvariations in the angularity of the valve stem. Instead of forming thespherical seating surface on the porcelain head, the head may besuitably recessed as at IOI, Fig. 12, and provided with an attachedseating ring I02 of some special seat material as described above.

Prior safety valves have commonly been subject to the defect ofexcessive frictional resistance in the packing for the stem which hascaused it to stick before opening and also delay its closing. I havefound that this difliculty may be overcome by filling the stufling boxI03 with a loose barrierv packing I 04, preferably loose asbestospacking, the vitreous lining of the housing being carried up through thestufling box, as shown. To seal the joint about the stem, as well as toretain the loose packing in the smiling box, a flexible diaphragm I05 issecured on the top of the stufling box, as by clamping it between theflanged outlet I06 of the housing and the bottom flange I01 of thebonnet I08. Diaphragm I05 is preferably formed of some suitablerubber-like material,

9 such as flexible natural or artificial rubber, and has an openingclosely embracing the enameled valve stem, under elastic tension, so asto seal These packing parts provide a mounting for the stem, but it hasbeen found preferably to'provide additional means for more closelyconfining and guiding the stem, comprising preferably a metal plate leiahaving an opening in which the stem is closely but loosely fitted, theplate being supported at its edges on the bonnet attaching bolts. Thismodification also is provided with means for conveniently grinding inthe valve parts, as

well as regrinding the same while in operation.

For this purpose, the upper end of the stem I09 is notched at III] andseated in a recess III in a knurled disk or hand wheel II2, which hasextended across its recess a rod III engaged in the slot I III of thestem. Disk or wheel 2 is thus mounted on the top of the stem, iorreciprocation therewith in the opening and closing of the valve andfurnishes a means for manually rotating or oscillating the stem whilelightly seated, to grind or regrind the valve parts.

' Fitted in a shallow recess in the top of disk 2 is a second disk Illhaving a recess in its upper side in which is rotatably seated thespherical lower end I I5 of a spindle IIB slidably reciprocating at itsupper end in an externally threaded sleeve Ill. Sleeve II'I engages in athreaded opening in the top portion H8 0! the bonnet. Riding on theenlarged lower end I I5 of the spindle is a collar II9 forming a seatfor the lower end of a compression spring I20 surrounding the spindleand bearing at its upper end against a collar I2I seated against thelower end of the sleeve 1. The upper end of sleeve has fixed thereon anut-like head I22 by means of which the sleeve may be turned to adjustit longitudinally in the bonnet and so adjust the compressive force ofthe spring on the spindle, the disks II 2 and I and on the upper end ofthe'valve stem 91, for urging it toward its seat. At I23 is a lock nutfor securing the sleeve in adjusted position.

Spindle .I I6 is extended upwardly beyond the sleeve II'I as at I24, andcarries a laterally extending washer I25 secured on the spindle by meansof lock nuts I 26. A hood I2'I on the top of the bonnet encloses theabove parts and fur nishes a pivotal support I28 for a lever I29 whichis branched at its upper end so as to loosely surround the hood. Eachlever branch ls formed with a shoulder I30 engaging the under surface ofthe washer I25 so that when the lever is lifted, it lifts spindle I ISin sleeve I IT to relieve the valve stem from the downward pressure oi.spring I20 and permit it to be'opened by the pressure in the valvehousing. The valve stem thus has, as described above, a reciprocatingmotion and also a rotary motion imparted by the wheel II2 for grindingthe valve parts. During transportation and storage of the valve, thelock nuts I26 may be screwed down to hold the spindle H5 up against thepressure of spring I20, so as to relieve the downward pressure of thevalve head on the seat and for grinding in the valve parts,

the lock nuts are backed ofl sufiiciently to. produce Just enoughdownward pressure'of the head on the seat, to give firm resistance'toturning of the disk or wheel II2, the valve parts being previouslywetted, as well understood in the art. In operation. the lock nuts I28are backed oiiso that the; full adjusted pressure of spring I20 isapplied to the valve stem.

It will thus be seen that the valve parts may be ground in withoutremoving the valve from the line, or loosening the bonnet from thevalve, or detaching any parts other than the hood I21, and such grindingor regrinding of the parts may, in fact, be carried on in a practicableway while the valve remains in operation.

It will be noted also that the valve spring and all of the operatingparts are located above the packing through which the glass coated stemextends and outside the housing so as to be free from attack bycorrosive liquids and gases passing through the valve.

This modification also may be provided with an auxiliary angular housingpant I, as described in connection with the above modifications, foradaptingthe valve for use as either a 45 angle or a straight line valve.

The invention thus accomplishes its purposes by providing a valvehousing having the strength and compactness of metallic material,combined with the full protection against corrosive attacksupplied byinterior surfaces of ceramic materials, the

valve head, stem and seat elements being readily assembled and preciselyalined in concentric relation and efiectively protected in operationagainst other than limited compressive stresses such as the ceramicmaterials are well adapted to withstand. The valve head may be readilyfitted with seating rings of various materials to adapt it for varioususes. The parts within the housing are readily accessible forinspection, cleaning, or removal, and the tight seating or the matingsurfaces may be maintained by light grinding treatment convenientlyaccomplished, from time to time, through rotation of the valve head incontact with. its seat, by means of the separate operating wheelsprovided for that purpose, all without detaching any of the valve partsor the housing from its connections. The parts may be reground, in fact,while remaining in operation. The durable porcelain valve head and seatare thus capable of remaining in precise, liquid tight, mating relationwith each other for indefinite periods or time.

While the invention has been disclosed by reference to the particulardetails and dimensions of a preferred embodiment, it is to be understoodthat such disclosure isintended to be merely illustrative, rather thanby way of limitation, as it is contemplated that various modificationsin the construction and arrangement oi! the parts will readily occur tothose skilled in the art within the spirit of the invention and thescope of the appended claims.

I claim:

I. An acid-resistant valve comprising a metal housing having a vitreousenamel lining, said housing having a body part and a conducting parteach formed with an opening at one side thereof and with a connectingflange about said opening,

means for drawing said flanges into seating engagement with each other,said body part havi its wall flared outwardly at said opening to adiameter larger than that of the opening of said conducting part :andforming an inwardly inclined shoulder about said opening, a separatelyformed ceramic seat ring having an inwardly surface lying against saidshoulder and an abutment overlying the flange of said conducting part.sheet packing between said ring surface and shoulder; resilientrubber-like gasket means between said ring abutment and said flange ofsaid conducting part for supporting said ring with an inwardly directed,resilient compressive force for centering the same in said opening, ametal valve stem mounted in said housing and having a vitreous enamelcoating, a valve head on said stem having a surface of corrosionresisting material. and means for operating said stem to open and closesaid valve. 7.

2. In a corrosion resisting valve, a metallic valve body having aconducting opening formed with an inwardly inclined shoulder, aconnecting flange about said opening, a metallic conducting part havinga connecting flange, said body and pant having their inner surfaceslined with a vitreous enamel and said flanges having cooperatingsea-ting surfaces and means for drawing the same together, a metallicvalve spindle movably mounted in said body and having a vitreous enamelcoating, a valve head on said spindle having a surface of corrosionresisting material, a separately formed ceramic valve seat having aninwardly inclined shoulder cooperating with said body shoulder and alsoa surface for cooperation with said conducting part, said seat beingspaced from said body and part, and resilient gasket material betweensaid seat and part and between said seat and body shoulders forcentering said seat relatively to said body opening and valve headbyresilient pressure thereon between said part and said body shoulderand for limiting transmission to said seat of strasses occurring betweensaid body and part.

3. In a corrosion resisting valve, a valve body having a conductingopening flared outwardly to form therein an inclined shoulder, aconnecting flange about said opening, a conducting part having anopening of less diameter than said body opening to form therewith anannular recess, a connecting flange about said opening of saidconducting part,- said body and part having inner surfaces of corrosionresisting material and said flanges having cooperating seating surfacesand means for drawing the same together, a valve spindle and headmovably mounted in said body and having surfaces of corrosion resistingmaterial, a separately formed seat ring of corrosion resisting materialhaving an outwardly extending flange located in said recess with oneside thereof cooperating with said conducting part and the other sidethereof inclined for cooperation with said body shoulder, said ringbeing spaced from said body and part, and resilient gasket materialbetween said ring flange and said part and body shoulder for centeringsaid ring relatively to said body opening and valve head by resilientpressure thereon applied by said means for drawing s'aid flange seatstogether and for limiting the transmission to said seat of stressesoccurring between said body and part.

4. In a corrosion resisting valve, a valve body having a conductingopening formed with an inwardly inclined shoulder, a connectin flangeabout said opening, a conducting part having a. connecting flange, saidbody and part having inner surfaces of corrosion resisting material andsaid flanges having cooperating seating surfaces and means for drawingthe same together, a separately formed valve seat of corrwion resistingmaterial having an inwardly inclined shoulder cooperating with said bodyshoulder and also a surface for cooperation with said conducting part,said seat beingspaced from said body and part, resilient gasket materialbetween said seat and part and between said seat and body shoulders forcentering said seal: relatively to said body opening by resilientpressure applied by said means for drawing said flange seats togetherand for limiting the transmission to said valve seat of stressesoccurring between said body and part, a valve spindle having a corrosionresisting surface mounted for movement in said body and extendingthrough said seat, and a valve head on said spindle having a surface ofcorrosion resisting material for cooperation with said seat on the sidethereof opposite said body shoulder, said conducting part being formedto provide clearance for the opening and closin movements of said valvehead.v

. 5. In a corrosion resisting valve, a valve body having an outwardlyflared conducting opening provided with a connecting flange, aconducting part having an opening of less diameter than said flared bodyopening to form therewith an annular recess and provided with aconnecting flange,

said body and conducting part having inner surfaces of corrosionresisting material and said flanges having cooperating seating surfacesand means for drawing the same together, a separately formed seat ringof corrosion resisting material located in said recess and having asleeve extending into the opening of said conducting part, resilientgasket material separating said ring from said part and resilientlysupporting srid ring in said recess, a valve spindle having a corrosionresisting surface mounted for movement in said body and extendingthrough said ring, and a valve head on said spindle having a surface ofcorrosion resisting material for cooperation with said ring sleeve, saidconducting part being formed to provide clearance for the opening andclosing movements of said valve head.

, 6. In a corrosion resisting valvega metal housing having a corrosionresisting lining and parted transversely of the flow passagetherethrough to provide a body part and a conducting part, each of saidparts having an opening provided with a connecting flange, said bodypart having an inwardly inclined shoulder therein about said opening,one of said housing parts having an outlet and the other having an inleteach arranged with its axis at an angle of 45 with said connectingflanges, means for drawing said connecting flanges into adjustableseated engagement with each other to form either a straight line valveor an angle valve, a separately formed seat ring of corrosion resistingmaterial having surfaces cooperating with said shoulder and conductingpart, resilient gasket means interposed between said ring and conductingpart for centering said ring on said shoulder by an inwardly directed,resilient compressive force, a valve stem and valve head movably mountedin said body part and having corrosion resisting surfaces, and means formoving said stem to move said head toward and from said ring, saidhousing parts being formed to provide clearance for the said movementsof said valve head.

OTTO W. GREENE.

REFERENCES CITED The following references are of record in the file ofthis patent:

(Other references on following page) 2 Number UNITED STATES PATENTS1,8,75574 Number Name Date 1,889,256 240,369 Blake Apr. 19, 18811,947,257 613,024 Byrne, Jr Oct. 25, 1898 5 1,991,621 746,402 SuttonDec. 8, 1903 2,155,697 1,260,509 Burge Mar. 26, 1918- 1,679,485 MaxwellAug. '7, 1928 1,805,710 Wilkins May 19, 1931 Number 1,840,904 JulianJan. 12, 1932 0 1,483

Name Date Duncan Sept. 6, 1932- Lipscomb Nov. 29, 1932 Fritz Feb. 13,1934 N011 Feb. 19, 1935 Zlnkil Apr. 25, 1939 FOREIGN PATENTS CountryDate Great Britain 1991

